{"id":90320,"date":"2018-03-10T00:15:42","date_gmt":"2018-03-10T00:15:42","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/produccion-de-poliaminas-en-phycomyces-blakesleeanus\/"},"modified":"2018-03-10T00:15:42","modified_gmt":"2018-03-10T00:15:42","slug":"produccion-de-poliaminas-en-phycomyces-blakesleeanus","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/quimica\/produccion-de-poliaminas-en-phycomyces-blakesleeanus\/","title":{"rendered":"Produccion de poliaminas en phycomyces blakesleeanus"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Beatriz Morera Oliveros <\/strong><\/h2>\n<p>Las poliaminas son compuestos nitrogenados policati\u00f3nicos de bajo peso molecular que se encuentran en todos los organismos. Son esenciales para el crecimiento y tienen papeles fisiol\u00f3gicos importantes, pero desconocidos.  se han investigado las variaciones en las concentraciones de poliaminas a lo largo de los ciclos de vida del hongo phycomyces blakesleeanus, que tiene putrescina y espermidina, pero no espermina. Se han utilizado cuatro mutantes (spe) residentes a diaminobutanona, un analogo sintetico de la putrescina que inhibe a la descarboxilasa de la ortinina.  en phycomyces se ha visto una relaci\u00f3n entre la m\u00e1xima concentraci\u00f3n de putrescina y la fase de crecimiento exponencial.  se ha secuenciado un fragmento del gen para la descarboxilasa de la ornitina de phycomyces, al que llamamos spea, cuya secuencia de aminoacidos es muy semejante a la de mucor.  las mutaciones spe no afectan de manera especial a ningun paso del desarrollo. la mutacion spe-2 es recesiva, la spe-4 es dominante y las spe-1 y spe-3 son intermedias. Las mutaciones spe-1 y spe-2 afectan a la descarboxilasa de la ornitina, modificando su sitio de union a la ornitina, y las mutaciones spe-3 y spe-4 afectan a la regulacion de la sintesis de descarboxilasa de la ornitina.  en phycomyces,organismo cenocitico, se pueden seleccionar los nucleos de los heterocariontes que llevan ciertos marcadores, pero no otros. Esta paradoja se resuelve observando que no se seleccionan nucleos, sino prop\u00e1gulos,seg\u00fan las condiciones del medio permitan su crecimiento.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Produccion de poliaminas en phycomyces blakesleeanus<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Produccion de poliaminas en phycomyces blakesleeanus <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Beatriz Morera Oliveros <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Sevilla<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 25\/05\/2001<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Enrique Cerd\u00e1 Olmedo<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Jos\u00e9 Mar\u00eda Vega piqueres <\/li>\n<li>eduardo Domenech Carlos (vocal)<\/li>\n<li>Jos\u00e9 Ruiz herrera (vocal)<\/li>\n<li>tahia Benitez fernandez (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Beatriz Morera Oliveros Las poliaminas son compuestos nitrogenados policati\u00f3nicos de bajo peso molecular que se encuentran en [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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